Because of course it is
Like with the Marathon Red mml which I uploaded recently, the mml included in "http://files3.bungie.org/trilogy/MarathonEvil.zip" is not the same as if you were playing the original Marathon Evil.
In this case, it is very different.
For example: the assault rifle in Evil was a “MOW-MDN/36CM ASLT-WPN”, not an “MA-90E”.
Those other names have been distributed for years, ever since Aleph One SDL was a new thing … does nobody else here play with the authentic Evil mml? Pardon me if I don't know whether some other total conversion named the fists a pair of “steel manacles”, and that the person making the old mml was confused, or whether they decided to invent new names when they wrote those old mml files.
So, if you wish to play Marathon Evil with the original text strings, you'll need to completely replace the "Evil Strings.mml" file which was included in the aforementioned "MarathonEvil.zip" package.
When you do replace the old mml with this one, there is one more thing you'll need to do: either rename the "Music.ogg" file to "Music Accursed.ogg" or change the string with index="10". In this mml file, the strings for default filenames were made for those who have all their scenario assets together in the same folder with the Marathon Aleph One executable a-k-a app. Those of us who do so disable individual mml by moving files to a different folder where Marathon Aleph One doesn't load them. You gain more flexibility with your scenarios if you do so, and you only need to ensure that filenames do not conflict.